<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>

      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 左侧边栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position="top">
        <!-- 步骤1 -->
        <el-tabs
          tab-position="left"
          v-model="activeIndex"
          :before-leave="beforeTabChange"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                expand-trigger="hover"
                v-model="selectedKeys"
                :options="cateList"
                :props="cascaderProps"
                @change="cascaderChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <!-- 步骤2 -->
          <el-tab-pane label="商品参数" name="1">
            <el-form-item v-for="item in queryParamRes" :key="item.attr_id" :label="item.attr_name">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <!-- 步骤3 -->
          <el-tab-pane label="商品属性" name="2">
            <el-form-item v-for="item in queryPropRes" :key="item.attr_id" :label="item.attr_name">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <!-- 步骤4 -->
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 步骤5 -->
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" @click="addGood" class="add-btn">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览的对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="40%">
      <img :src="previewUrl" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 当前添加商品正在进行的步骤
      activeIndex: '0',
      // 添加商品表单
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: '',
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 添加商品表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', tigger: 'blue' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', tigger: 'blue' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', tigger: 'blue' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', tigger: 'blue' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品数量', tigger: 'blue' }
        ]
      },
      // 分类列表
      cateList: [],
      selectedKeys: [],
      cascaderProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 查询参数返回的数据
      queryParamRes: [],
      queryPropRes: [],
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 绑定请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览的url
      previewUrl: '',
      // 图片预览对话框可见性
      previewVisible: false
    }
  },
  created() {
    this.getCateLsit()
  },
  methods: {
    async getCateLsit() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类列表失败！')
      }
      this.cateList = res.data
    },
    cascaderChange() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        return this.$message.warning('请选择三级分类！')
      }
      this.addForm.goods_cat = this.selectedKeys.join(',')
    },
    // 当没有选择三级分类禁止选择下一标签页
    beforeTabChange(activeIndex, oldActiveIndex) {
      if (oldActiveIndex === '0' && this.selectedKeys.length !== 3) {
        this.$message.warning('请选择商品分类！')
        return false
      }
    },
    // 标签被点击时触发事件
    tabClicked() {
      if (this.activeIndex === '1') {
        this.$http
          .get(`categories/${this.selectedKeys[2]}/attributes`, {
            params: { sel: 'many' }
          })
          .then(res => {
            res = res.data
            if (res.meta.status !== 200) {
              return this.$message.error('获取参数失败！')
            }
            res.data.forEach(item => {
              item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
            })
            this.queryParamRes = res.data
          })
      } else if (this.activeIndex === '2') {
        this.$http
          .get(`categories/${this.selectedKeys[2]}/attributes`, {
            params: { sel: 'only' }
          })
          .then(res => {
            res = res.data
            if (res.meta.status !== 200) {
              return this.$message.error('获取参数失败！')
            }
            this.queryPropRes = res.data
          })
      }
    },
    // 预览图片操作
    handlePreview(file) {
      this.previewUrl = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片操作
    handleRemove(file) {
      let curTemPath = file.response.data.tmp_path
      let index = this.addForm.pics.findIndex(item => {
        return item.pic === curTemPath
      })
      this.addForm.pics.splice(index, 1)
    },
    // 上传成功时的钩子函数
    handleSuccess(res) {
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      let picObj = {
        pic: res.data.tmp_path
      }
      this.addForm.pics.push(picObj)
    },
    // 添加商品
    addGood() {
      this.$refs.addFormRef.validate(async validate => {
        if (!validate) {
          return this.$message.warning('请填写必要的表单项')
        }
        this.queryParamRes.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(',')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.queryPropRes.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        const { data: res } = await this.$http.post('goods', this.addForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 5px 10px 0 0 !important;
}
.previewImg {
  width: 100%;
  height: 100%;
}
.add-btn {
  margin-top: 20px;
}
</style>
